Roller applicators for liquids



June 8, 1965 J. A. FUGATE ROLLER APPLICATORS FOR LIQUIDS .2 Sheets-Sheet 1 Filed April 2, 1963 FUGATE A S E M J ATTORNEY 1 3,137,369 ROLLER APPLICATOR FGR LIQUIDS James A. Frigate, 1239 S. Sanduslzy, Tulsa 12, Girls.

' Filed Apr. 2, 1963, Ser. No. 270,064

13 Claims. (Cl. 15-548) The present invention pertains to an assembly for applying liquid to a surface to be treated and the invention more particularly relates to roller applicators for applying liquid or paint to a surface to be coated and the assembly provides for liquid being transferred from' a supply line through the interior of a roller applicator and to the periphery thereof by pump means carried by and housed within the roller applicator with the pumping mechanism activated by rotation of the roller.

In my copending application Serial No. 131,813, filed August 16, 1961, there is disclosed roller applicators equipped with reciprocating pump mechanisms within the roller serving to transfer liquid from a supply through the interior of the roller to the outer shell. It is an object of the present invention to provide improvements in such roller applicators wherein the pump mechanisms are of the rotary type and to provide roller applicators housing pumps of simplified constructions.

A more specific object of the invention is to provide a gear type pump within a roller device wherein the outer rotor of the pump mechanism is rotated by rolling action of the roller applicator and serves as an impeller element to drive an inner pump rotor which functions as an impelled element during rotation of the roller applicator to draw liquid from a supply reservoir into the interior of the roller applicator and to force the liquid by pump action to the periphery of the roller and into the presence of the outer shell.

Another object of the invention is to provide a roller type device for applying liquid to a surface to be treated with a rotary pump mechanism within the roller actuated by rotation of the roller applicator and with the elements of the pump so shaped and arranged as to avoid enlargement of the conventional type roller and without materially increasing the Weight of the'device and withthe elements of the pump designed so that they may be readily disassembled to permit cleaning of the component parts.

Other objects and features of the invention will become apparent and will be appreciated by those skilled in the art to which the invention pertains as the present disclosure proceeds and upon'consideration of the following detaileddescription taken in conjunction with the accompanying t drawings wherein several embodiments of the invention are disclosed. s r

In therdrawings: f FIG. 1 is an elevational view of a roller applicator embodying the invention and showing elements associated therewith serving to provide a supply source for liquid.

FIG. 2 is an axial sectional view of an applicator asnj'irecl States Patent Patented June 8, 1965 Referring to the drawings there is shown at 10 a handle designed to be gripped by an individual. The handle has an opening lengthwise therethrough for receiving and supporting a straight portion 11 of a tube 12. The tube 12 may be formed of any suitable substantially rigid materialso as to serve as means for supporting and manipulating a roller applicator and as means for encasing and guiding liquid from a reservoir into the interior of the applicator. The handle lti is desirably located intermediate the length of the roller applicator 14 and the tube 12 has angular portions to properly dispose the handle 11) in the desired position. The tube 12 carries an end portion 16 located remotely of the handle 10 and the tube continues into the applicator as a hollow tube portion 17. The tube portion 17 may be reinforced by tapered external ribs 15 one of which is shown in FIG. 2. The liquid or paint may be stored in a container 18 which is desirably formed of flexible material and equipped with a strap 19 for supporting the container from a shoulder of an operator. The container may be of such construction that it may be maintained closed until a flexible hose 20 which extends from the tube 12 is connected thereto. The paint orother liquid may be shipped in such a closed container and the hose 20 may be connected thereto without loss of the liquid and without significant exposure to atmosphere prior to being applied to a surface to be treated. v

A roller type applicator equipped with one. type of pump mechanism is shown in FIGS. 2 to 4. An element of the roller structure cooperates with the pump mechanism housed therewithin and the assembly includes an elongated tubular shaped member 21 which is substantially of cylindrical shape. The tubular member 21 is provided with an annular recess 22 throughout a major portion of the peripheryand the ends. of the recess are defined by annular ribs 23 and 24. A conventional type of outer shell 26 having openings 27 and interstices in a web portion permits liquid accommodated in the annular recess 22 to move to the periphery of the shell and transferred onto the surface to be treated during rolling action of the applicator. i

The tubular member 21 is adapted to rotate about the am's of the tube portion 17 which constitutes a non-rotatable'support forthe assembly and carries a disc-shaped.

member 31 in fixed relationship therewith. The peripheral surface of the disc-shaped member 31 serves as a bear-' ing for an inner cylindrical surface 32 of the tubular member 21. The tubular member 21 and the shell 26 rotate as a unit about the axis of the tube portion 17. The disc member 31 carries a stub shaft 33 as shown in FIG. 2. The

axis of the stub shaft 33 is displaced from the axis of the I tube portion 17 and from the axis of the tubular member 21 sembly exhibiting the invention and showing portions of the pump mechanism inside elevation.

FIG. 3Ts a transverse sectional View taken on the line 34 of FIG. 2;

' FIG. 7 is an axial sectional v-iew of another 'type' of applicator. v 7 I FIG. 8 is a. sectional view taken on the line tifsfof FIG. 7. i

I 'FIG. 9 isv a transyerse sectional View taken on the line 9-.-9 of FIG. 7. I

c I a transverse sectional view taken on the line 6-6 Of FIG,- 5.

as best shown in FIG. 3. An open passage 34 within the tube portion 17 extends throughthe disc member 31 and through the stub shaft 33; A radially disposedduct 36 is provided within the disc member 31 in communication with the passage 34 as shown in FIG. 2. The duct 36 terminates in an axially disposed port 37 whichhas an open end at an inner face of the disc member 31. The circumferential location of the port.-37- remains in a non-rotatable position and substantially in a four oclock position as shown inFIG. 3. c

i A pump of the gear type; is housed and mounted Within the roller applicator. The pump rnechanisr'ri includes "an inner rotor element'39 which is mounted forfree rotation of the stub shaft '33 and about the axis'thereof. The rotor element 39 isequipp'ed with lobes" or teeth41 of 'suitablelprofile; .The' pump mechanism includes an outer rotor element 42 which surrounds the rotor. 39f as best shown in FIG. crescent-shaped non-rotatable member carried by the disc member 31ex'tends into Y an area between the periphery of the inner rotor element 39 and the inner surfaces of the outer rotor element 42. The outer pump element 42 is adapted to rotate about the axis of the tube portion 17. The pump element 42 is provided with circumferentially spaced cavities 4t) for receiving the lobes on the inner rotor element 39 throughout a limited circumferential portion of the pump assembly.

A second disc member 43 within the tubular member 21 has peripheral surfaces which serve as a further bearing for the tubular member 21. The disc member 43 is maintained in non-rotatable relationship by means of a pin 44 which fits into a cavity in the stub shaft 33 and a registering aperture in the disc member 43. The disc member 43 serves as a cover plate for the rotary pump elements 39 and 42. A tubular projection 46 on the stub shaft 33 extends through the disc member 43 and the end of the projection is equipped with external threads for receiving threads formed within a stem 47. A shoulder at the end of the cylindrical wall 45 abuts the disc member 43 and holds the inner face thereof adjacent an end face of the stub shaft 33 and end surfaces of the rotary pump elements 33 and 42. The cup-shaped end portion of the stem 47 closes the passage 34 which extends through the stub shaft 33 and the tubular projection 46. The other end of the stem 47 is equipped with radially disposed arms 51 for threading the stem onto the tubular projection 46. A rim 52 carried by the arms 51 cooperates with a bevelled surface 53 on the tubular member 21. A generally disc-shaped member 54 cooperates with a bevelled surface 56 at the other end of the tubular element 21. These bevelled surfaces serve to maintain the rotatable assembly in operative relation with the pump mechanism and serve as further bearing surfaces.

An opening 61 is provided in the central portion of the cylindrical wall of the tubular member 21 for accommodating a pawl 62 which is resiliently supported by a leaf type spring 63 attached to the perimeter of the tubular member 21 by means of a screw 64. The pawl 62 is biased inwardly through the opening 61. Teeth 66 are provided throughout the circumference of the outer rotor pump element 42 and these teeth are in position to be engaged by the pawl 62. The pawl and the teeth 66 provide one way clutch means and its functions will become apparent as the disclosure proceeds. The disc member 43' is provided with a circumferentially extending channel 71' throughout the circumference thereof. A plurality of openings '72 extend through the wall of the tubular element 21 and these openings are in communication with the channel 71. An exit port '73 for the pump mechanism is provided within the disc member 43 and extends partially therethrough and remains in approximately the eight oclock position as shown in FIG. 4. A duct 75 (FIG. 4) formed within the disc member 43 provides communication from the port 73 to the channel 71.

The assembly illustrated in FIGS. 1 to 4 includes a pump mechanism which provides pumping action during rotary movement of the tubular member 21 and its shell 26 in one direction. Pumping action is provided during rotation of the tubular member 21 in a counter-clockwise direction in FIG. 3. The pawl 62 engages a tooth 66 and the outer rotor element 42 rotates with the tubular member 21 while being guided between the non-rotating disc members 31 and 43. Such rotary motion of the pump element 42 causes the impelled pump element 39 to rotate. As the lobes 41 in the vicinity of the inlet port 37 retracts from the cavities t a low pressure condition is developed which draws liquid from the container 13 through the flexible tube 26 and the tube 12 and through the passage 34 into the duct 36 and through the inlet port 37 into the pump mechanism. The liquid between the lobes 41 and within the lobe cavities 40 moves in a counter-clockwise direction in FIG. 3. The crescentshaped segment serves to retain the liquid within the cavities 48 and functions to maintain the liquid within the spaces between the lobes 41 as the pump elements rotate. The discharge port 73 is located at an area immediately prior to the zone where lobes 41 reenter the cavities and in approximately the eight oclock position in FIG. 3. Liquid is forced through the discharge port 73 (FIG. 4) and through the duct 75 into the channel 71. The liquid moves circumferentially within the channel '71 and escapes through the openings 72. Such pumping action continues as long as the tubular member 21 continues to rotate in a counter-clockwise direction. During an opposite stroke of the roller applicator and when the tubular member 21 rotates in a clockwise direction in FIG. 3 the pawl 62 rides over the teeth 66. The friction of the side faces of the rotor elements 39 and 42 with the disc members 31 and 43 and friction between the rotary elements and other stationary parts of the assembly is sufiicient to maintain the rotor element 42 in non-rotating position. The absence of rotor movement of the pump element 42 avoids pumping action during clockwise rotation of the shell 26 and its supporting tubular member 21. Pumping action is again attained when the tubular member 21 and the shell rotate in counter-clockwise direction.

A modified assembly is shown in FIGS. 5 and 6 wherein the stem 47a is equipped with a flange 76 having a peripheral surface which serves as a bearing surface for the tubular member 21a. The end of the cylindrical wall a abuts the disc member 43a and maintains it in association with the side faces of the rotor elements of the pump mechanism. The disc member 43a is maintained in a non-rotatable position by the pin 44. An annular chamber 71a is provided between the flange 76 and the disc member 43a into which the liquid is discharged for escape through the openings 72. The tubular member 21a as shown in FIG. 5 is engaged by a retaining disc 77 which in cooperation with the disc shaped member 54 maintains the pump mechanism in operative association with the pawl 62 and the discharge openings 72. The flange 77 may be provided with openings 78 for receiving fingers or a suitable tool for facilitating the threading of the tubular portion 45a of the stem on the threads of the projection 46. The flange 76 and the disc member 43a together with the disc member 31a in the embodiment shown in FIG. 5 serves as bearings about which the tubular member 21a rotates. The disc-shaped member 54 also serves as a bearing member and cooperates with flange '77 to maintain the rotatable elements in operative relationship with the pump mechanism. The pump elements in the assembly illustrated in FIGS. 5 and 6 diifer in minor respects from the first embodiment and the impelled rotor element 3% has a smaller number of lobes 41a and these mesh throughout a small sector with cavities 40a of the outer rotor or impeller element 42a.

The embodiment shown in FIGS. 5 and 6 operates in substantially the same manner as the roller applicator disclosed in connection with FIGS. 2 to 4 and pumping action is developed during rotation of the tubular member 21a in one direction and there is no pumping action during rotation in an opposite direction. During rotation of the outer rotor element 42a in counter-clockwise direction in FIG. 6 the pawl 62 engages a tooth 66. The pump element 42a then moves with the tubular member 21a and pump element 39a is driven in a counterclockwise direction about the axis of the stub shaft 33.

Liquid is drawn through the passage 34 within the tube tinue to turn in a counter-clockwise direction in FIG. 6

, the liquid accommodated in the cavities 40a and bears s-e9 approximately an eight oclock position with reference to FIG. 6 and extends through the disc member 43a. The liquid is thus forced into the annular channel or chamber 71a and through the openings 72. When the roller applicator is rotated in an opposite direction the pawl s2 rides over the ratchet teeth 66, and the pump elements 42a and 39a are not rotated because of the friction between their side faces and the disc members 31a and 43a and friction of the rotatable elements with the associated non-rotatable surfaces.

'If desired a check valve assembly 79 may be provided within the passage 34 to prevent backward or upstream movement of the liquid in the supply line. Such a valve may include a ball 89 which is activated by a spring 81 to seat on annular surface formed around the passage 34 and block return flow in the supply line. The valve 79 blocks return movement of liquid from the pump and serves to prevent rotation of the pump elements 42a and 7 clockwise rotation of the tubular member 21b to pump liquid from the supply line to the annular recess 22. In this embodiment the tube portion l7bis equipped with a disc member 54b which remains stationary and serves as a bearing element for one end of the tubular member Zdbi The tube portion 17b carries a disc shaped member 31b which remains stationary and it is equipped with two flanges '52 and 33 which serve as stationary bearing supports for the tubular member 21b. The flanges 82 and S3 in cooperation with the inner cylindrical surface 32 of the tubular member 21a provide an annular chamber 84. A duct 36b provides communication from the pass-age 34 to the annular chamber 84. The exit end of the duct 3% is releasebly closed by check valve means which takes the'form of an elastic band 35. The disc member 3111 carries the stub shaft 33 about which the driven rotary element 3% of the pump mechanism turns. The driving element 42b of the pump rotates about an axis which coincides with the axis of the tubular member 2111. A disc member 43b covers the side faces of the rotary pump elements. The disc member 4322 is maintained in a non-rotatable position by the dowel pin 44.

The periphery of the disc member 43b serves as a further bearingsurfacei An annular fiange 86 is carried by the tubular member 21b and extends inwardly therefrom. The stem 471) has internal threads which are adaptedto engage the threads on the tubular projection 46 and closes the end of the passage 34; Aperipheral 'lip 37 carried by the stem 47b abuts the flange 36 and the free'end of the cylindrical wall 451) abuts and holds the disc element 43b inoperative association 'withthe pump elements. The

lip 37 cooperates with the disc member 5 th to maintain the parts in assembled relationship. The inner circumference of the flange 36 rides on the exterior of the cylindrical wall 45b and provides further bearing support for the tubular member 21b. V i i An annular chamber 7lb isprovided between the flange 86 and the disc member 4312. Openings'TZ provide communication from thechamber 71b to the annular space 22 and openings 72] provide. communication from the annular chamber 84 tothe-annular space 22;. Theexit ends of the open-ings iZand 7217 are normally closed by checkvalve means which may take the form of elastic bands 88 and'89.- Ther'ej are-inlet-openings .91 from the There is no onefw ay clutch mechanism between the tubularmemberjmb and the outer pump element 42b. An axially extending groove 96 in the peripheiyof the pump impeller element 42b is engaged by a key W, carried by a leaf type spring 93 which is attached to the tubular member 2112 by means of a screw 99. The key 97 provides a driving connection between the outer pump element 42b and the tubular member 21b. Any suitable key arrangement may be employed to provide a detachable driving connection between the rotary pump element 42b and the tubular member 21b. 7

In operation and when the tubular member 21!) rotates in a counter-clockwise direction in FIG. 8 liquid is drawn into the annularchamber 84 through the check valve 85 because of the low pressure condition developed at the port 37 (PEG. 8). The check valve 39 prevents liquid within the annular space 22 from being drawn into chamber 84. Rotation of thepump elements 42b and 39b in a counter-clockwise direction in FIG. 8 moves liquid from the tube portion 17b through the duct 36b and the port 37 into the pump assembly and through the opening '73 which extends through the disc member 4311 in approximately an eight oclock position with reference to FIG. 9 and the liquid is forced into the chamber 71b. The check valve 93 prevents liquid that may be accommodated in the small annular chamber 92 from moving into the passage 34 and into the tube portion 17b. The liquid is accordingly forced through the openings 72 and past the check valve $8 into the annular space 22. When the roller applicator is manipulated causing the tubular member 21b to rotate in a clockwise direction in FIG. 8 liquid is drawn from the passage 34 through the openings 91 past the check valve 93 and through the openings 9-? and through the opening '73 (FIG. 9) into the presence of the pump elements. The check valve .88 prevents liquid within the annular'space 22 from being drawn into the chamber 71b. The liquid is forced by the pump'elements through the opening 37 into the annular chamber 34. The check valve 85 prevents liquid within the chamber 84 from moving into the passage 34. The liquid in the annular chamber 84- is thus forced through the openings 72band past the check valve 89 into the annular space 22. r

Ifdesired a valve 1&2 may be provided in the supply line as shown in FIG. 1 to admit limited and controlled quantities of air into the tube 12 and thereby adjust the volume of liquid delivered by the several pump mechanisms. It will be appreciated that any rotary applicators may be equipped with any of the pump mechanisms disclosed and any. of such assemblies may be employed with the equipment-shown in FIG. 1.

While the invention has been described with reference to specific structural features and with regard to various assemblies it will be appreciated that modifications may be made in the components as well as the overall org'anization. Such modifications and others may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

What I claim and desire to secure by Letters Patent is:

1. A roller applicator for liquids comprising, a liquid supply tube including a substantially straight'tube portion having'a passage therethrough, an elongated tubular mem-' ber surrounding." said tube :portion, an applicator shell carriedby and surrounding'the periphery of said tubular member, means supporting'said tubular member for" rotation about the axis of said tube portion, a disc member carried by saidtube portion, a stub shaft carried by said disc member with-its axissubstantiallyparallel to anddisplaced'from the axis of said tube portion, an inner rotary pump element rotatable on and about the axis of said stub shaft with an end surface abutting said disc member, an outer rotary-pump element surrounding" said inner pump element rotatable about-the axis of said illbEaPOI'tlOlTWlth anend surface abuttingsaid disc member; said pum'p elements having lobes and cavities whicli v mesh'throughlimited sectors of said pump elements,..a

second disc member abutting the otherjvend surfaces of said pump elementsymeans providing a driving connection between the tubular member and said outer pump element, said first disc member having a port in communication with said pump elements Where said lobes retreat from said cavities, said first disc member having a duct therein providing communication from said passage to said port, said second disc member having a second port in communication with said pump elements Where the lobes enter said cavities, means providing an annular chamber in communication with said second port, and said tubular member having openings generally radially therethrough in communication with said chamber.

2. A roller applicator for liquids comprising in combination, a liquid supply tube including a substantially straight tube portion having a passage extending therewithin, an elongated tubular member having a substantially cylindrical shaped inner surface surrounding said tube portion, an applicator shell carried by and covering the periphery of said tubular member, a disc member carried by said tube portion having a peripheral surface forming a bearing for said inner surface, a stub shaft carried by said disc member with its axis substantially parallel to and displaced from the axis of said tube portion, an inner rotary pump element rotatable on and about the axis of said stub shaft with an end surface abutting said disc member, an outer rotary pump element surrounding said inner pump element rotatable about the axis of said tube portion with an end surface abutting said disc member, said pump elements having lobes and cavities which mesh throughout a limited circumferential are, a second disc member abutting the other end surfaces of said pump elements and having a peripheral surface forming a bearing for said inner surface whereby the tubular member may rotate about said bearings, means providing a driving connection between the tubular member and said outer pump element, said first disc member having an inlet port in communication with said pump elements in a zone where said lobes retreat from said cavities, said first disc member having a duct providing communication from said passage to said inlet port, said second disc member having A an outlet port in communication with said pump elements in a zone where said lobes enter said cavities, and means providing communication from said outlet port to the periphery of said tubular member.

3. A roller applicator for liquids comprising, a liquid supply tube including a substantially straight tube portion having a passage therethrough, an elongated tubular member surrounding said tube portion, an applicator shell carried by and enclosing the periphery of said tubular member, means supporting said tubular member for rotation about the axis of said tube portion, a disc member carried by said tube portion, a stub shaft carried by said disc'member with its axis substantially parallel to and displaced from the axis of said tube portion, an inner rotary pump element rotatable on and about the axis of said stub shaft with an end surface abutting said disc member, an outer rotary pump element surrounding said inner pump element rotatable about the axis of said tube portion with an end surface abutting said disc member, said pump elements having lobesand cavities which mesh through limited sectors of said pump elements, a second disc member abutting the other end surfaces of said pump elements, means providing a driving connection between the tubular member and said outer pump element, said first disc member having a port in communication with said rotary pump-elements in a zone where said lobes retreat from said cavities, said first disc member having a I duct therein providing communication from said passage to said port, said second disc member having a second port in communication with'said pump elements in a zone where said lobes move into said cavities, means providing a chamber in communication with said second port, said tubular member having openings generally radially therethrough in communication with said chamber, and check valve means preventing upstream movement of liquid in said supply tube.

4. A roller applicator for liquids according to claim 3 wherein the check valve means is arranged within said applicator.

5. A roller applicator for liquids comprising, a liquid supply tube including a tube portion having a passage therethrough, an elongated tubular member surrounding said tube portion, an applicator shell surrounding the periphery of said tubular member and secured thereto, means supporting said tubular member for rotation about the axis of said tube portion, a disc member carried by said tube portion, a stub shaft carried by said disc member with its axis substantially parallel to and displaced from the axis of said tube portion, an inner rotary pump element rotatable on and about the axis of said stub shaft with an end surface abutting said disc member, an outer rotary pump element surrounding said inner pump element rotatable about the axis of said tube portion with an end surface abutting said disc member, said rotary pump elements having lobes and cavities which interfit through a circumferential portion of each pump element, a second disc member abutting the other end surfaces of said rotary pump elements, a one way clutch mechanism between the tubular member and said outer pump element, said first disc member having an inlet port in communication with said pump elements in a zone where said lobes retreat from said cavities, said first disc member having a duct therein providing communication from said passage to said inlet port, said second disc member having an outlet port in communication with said pump elements in a zone where said lobes move into said cavities, means providing a chamber in communication with said outlet port, and said tubular member having openings therethrough in communication with said chamber.

6. A roller applicator for liquids according to claim 5 wherein the one Way clutch mechanism comprises ratchet teeth carried by the outer pump element and a pawl carried by said tubular member.

7. A roller applicator for liquids comprising, a liquid supply tube including a tube portion having a passage therethrough, an elongated tubular member surrounding said tube portion, an applicator shell surrounding the periphery of said tubular member, a disc member carried by said tube portion having a peripheral surface serving as a bearing for said tubular member, a second disc member spaced from the first disc member having a peripheral surface serving as a bearing for said tubular member, a stub shaft carried by the first disc member having its axis displaced from and substantially parallel to the axis of said tube portion, an inner rotary pump element rotatable on said stub shaft between said disc members, an outer rotary pump element between said disc members rotatable about the axis of said tube portion with said disc members providing end covers for said pump elements, said pump elements having lobes and cavities which mesh throughout a limited portion of their rotary movement, means providing a driving connection between the tubular member and said outer pump element during one direction of rotation of the tubular member with respect to said disc members, means forming an inlet port in communication With said pump elements in a zone where said lobes retreat from said cavities, means providing a duct communicating said passage with said inlet port, means forming an outlet port in communication with said pump elements in a zone where said lobes move into said cavities, and means guiding liquid from said outlet port to the periphery of said tubular member.

8. A roller applicator for liquids comprising, a liquid supply line including a tube portion having a passage therewithin, an elongated tubular member surrounding said tube portion, an applicator shell encasing the periphcry of said tubular member, a'disc member carried by said tube portion having'a peripheral surface serving as a bearing for the tubular member, a second disc member spaced from the first disc member having a peripheral surface serving as a bearing for said tubular member, a stub shaft carried by the first disc member extending towards the second disc member with its axis displaced from and sub stantially parallel to said tube portion, an inner rotary pump element supported for rotation on said stub shaft between said disc members, an outer rotary pump element rotatable about the axis of said tube portion between said disc members, said pump elements having lobes and cavities which mesh throughout a limited are, means providing a driving connection between the tubular member and the outer pump elemenbmeans providing a first annular chamber at one side of said pump elements, said tubular member having openings therethrough in communication with said first chamber, means providing a second annular chamber at the other side of said pump elements, said tubular member having openings therethrough in communication with the second annular chamber, said first disc member having a port therein open to said pump elements in the vicinity of one end of said are and in communication with the first annular chamber, said second disc member having a port therein open to said pump elements in the vicinity of the other end of said are and in communication with the second annular chamber, means providing communication from said passage to said first annular chamben'check valve means preventing movement of liquid from the first annular chamber into said passage, means providing communication from said passage to the second annular chamber, check valve means preventing movement of liquid from' the second annular chamber into said passage, check valve means preventing liquid at the periphery of the tubular member 7 from moving into the first annular chamber, and check of a key carried by thetubular member detachably engaging said outer pump element.

10. A roller applicator for liquids comprising, a liquid supply tube including a tube portion having a passagetherein, an elongated tubular member surrounding said tube portion, an applicator shell surrounding the periphery of said tubular member, a disc member carried by said tube portion having a peripheral surface serving as a bearing for said tubular member, a second disc member spaced from the first disc member having a peripheral surface serving as a bearing for said tubular, member, a stub shaft carried by the first discmember having its axis displaced from and substantially parallel to the axis of rotation of said tubular member, an inner rotary pump element rotatable on said stub shaft between said disc members, an outer rotary pump element between said disc members rotatable about the axis of rotation of communication with said passage, means forming a port in communication with said pump elements in the vicinity of the other end of said arc, and means guiding liquid from the last-mentioned port to the periphery of said tubular member.

11, A roller applicator for liquids according to claim 10 wherein a tubular projection on the stub shaft extends through the second disc member, and detachable means I aboutvthe axis of rotation of said tubular member, said engaging said tubular projection abutting the second disc member.

12. A roller applicator for liquids comprising, a liqiud supply tube including a tube portion having a passage therein, an elongated tubular member surrounding said tube portion, an applicator shell surrounding the periphery of said tubular member, means supporting said tubular member for rotary movement about said tube portion, a V rotary pump mechanism within said tubular member including an inner rotary pump element rotatable about an axis parallel to but displaced from the axis of said tubular member and an outer rotary pump, element rotatable pump elements having lobes and cavities which mesh throughout a limited circumferentially extending arc of.

rotary movement, means providing a driving connection between the tubular member and said outer pump element during rotation of the tubular membenmeans providing 7 a port in communication with said pump elements in the vicinity of one end of said are and in communication with said passage, means providing a port in communication with said pump elements in the vicinity of the other end of said are, and means guiding liquid from the last-mentioned port to the periphery of said tubular member.

13. A roller applicator for fluids comprising, a liquid supply line including a substantially straight tube portion having a passage therein, a tubular member and bearing means carried by said tube portion supporting said tubular member for rotation about the axis of said tube portion, an applicator shell carried by and covering the periphery of said tubular member, rotary gear pump means positioned Within said tubular member, said pump means having an inlet in communication with the passage in said tube portion and an outlet discharging through openings in said tubular member within said shell, and means .interengaging the tubular member and said pump means operable in response to rotation of said tubular member to drive said pump means to draw liquid through said supply line and deliver it within said applicator shell.

References Cited by the Examiner V UNITED STATES PATENTS.

1,892,217 12/32 Moineau 2223 72 WALTER A. SCHEEL, Primary Examiner, 

13. A ROLLER APPLICATOR FOR FLUIDS COMPRISING, A LIQUID SUPPLY LINE INCLUDING A SUBSTANTIALLY STRAIGHT TUBE PORTION HAVING A PASSAGE THEREIN, A TUBULAR MEMBER AND BEARING MEANS CARRIED BY SAID TUBE PORTION SUPPORTING SAID TUBULAR MEMBER FOR ROTATION ABOUT THE AXIS OF SAID TUBE PORTION, AN APPLICATOR SHELL CARRIED BY AND COVERING THE PERIPHERY OF SAID TUBULAR MEMBER, ROTARY GEAR PUMP MEANS POSITIONED WITHIN SAID TUBULAR MEMBER, SAID PUMP MEANS HAVING AN INLET IN COMMUNICATION WITH THE PASSAGE IN SAID TUBE PORTION AND AN OUTLET DISCHARGING THROUGH OPENINGS IN SAID TUBULAR MEMBER WITHIN SAID SHELL, AND MEANS INTERENGAGING THE TUBULAR MEMBER AND SAID PUMP MEANS OPERABLE IN RESPONSE TO ROTATION OF SAID TUBULAR MEMBER TO DRIVE SAID PUMP MEANS TO DRAW LIQUID THROUGH SAID SUPPLY LINE AND DELIVER IT WITHIN SAID APPLICATOR SHELL. 